Oct 4, 2012 8:00am PDT
under and that's going to squash the air up to half size. and that brings us up to boyle's law. boyle's law named after a dude by the name of robert j. law, okay, we're learning these things, all right? and boyle's law just says that pressure multiplied by volume at any one point will equal pressure times volume at another point. so get twice the pressure, you'll get twice the volume. you'll have half the volume. yeah, what i told twice the pressure will be half the volume. very good, lee, sometimes i goof a rooney a little bit, right gang, but does that make sense gang? so you get twice-- you get twice the pressure that's going to squash that stuff up. so the volume will be half as much, huh? what if you push--so you've got three times the pressure, then the volume will get squashed up to how much? a third. how about--i don't know if you can do this. let me try, seven times the pressure, okay, okay, now i shouldn't say seven, now let's say five times the pressure, a fifth right? how about nine times-- how about--all right, here is for the a students, 7.9 times the pressure...
Oct 2, 2012 8:00am PDT
? newton's third law. glass pushes water. how hard? the same. just as hard as if it were--huh? let's try this. okay, one more time. see, the vase like that. this water is pushing down against the side, but the side is pushing back up against the water. how hard? just as if you had all the water right here. so it turns out it really does only depend on the depth. let's see what happens with something like this. narrower, narrower tube. [laughter] and there we have it, gang. and we see what? [laughter] exactly the same pressure. isn't that neat? isn't that neat? you like, huh? mmm. huh, huh? doesn't physics always work? [laughter] yeah. all right. you get the idea. hey, but, you know, this is kind of strange, that a little narrow tube like that can exert just as much pressure on the bottom as a wide one. how can we explain that, gang? let's look at the--this time we have a tube like this. okay? how can the pressure down at the bottom here be just the same as if it were all filled with water? it behaves the same, doesn't it? but there's no water here. it turns out that water pressure acts in all
Oct 8, 2012 3:00pm PDT
. >> these drone attacks are a violation of international law. these drone attacks are a violation of the human rights of the pakistani people. do we all condemn them? we want to send a message to america, the more drone attacks to carry out, the more the people will grow to hate you and raise their arms against you. our tribal people will not be scared off with drone attacks. >> more than 30 u.s. citizens with the group codepink traveled to pakistan to take part in the march and meet with drone strike victims. >> the illegal, immoral, a brutal attacks on the innocent people of waziristan and the fatah region must in now. these are illegal drone strikes carried out by cia. cia is a civilian organization using military equipment rid this is a war crime. >> they are illegal. they are against international law. they invade the sovereignty of pakistan and they are not productive. >> an u.s. protest held in solidarity with the march in pakistan, 10 people were arrested on friday at the hancock field air national guard base in new york. members of the upstate coalition to ground the drones
Oct 9, 2012 3:00pm PDT
, when zoning laws prohibited her from building on her backyard land, so she built an orchard instead, an orchard that was inspired by one famous lady. >> i love meyer lemons. i have always--from the very first time i tasted one, i thought it was the most wonderful thing i'd ever tasted. so i was looking at this big backyard full of weeds, and i thought, you know what? if martha is using--martha stewart is using meyer lemons, i bet you i could grow meyer lemons and sell them online. > indeed, since martha stewart began using meyer lemons in the nineties, their notoriety has exploded. thin-skinned and slightly less acidic than other varieties, meyer lemons are known as backyard lemons because they're usually too fragile to ship, so therefore they're not often sold commercially. so when karen planted 40 trees in her backyard, she hoped to sell a few to neighbors and friends maybe, but nearly 6 years and 80,000 lemons harvested later, and the backyard fruit has turned karen's backyard into a full-time farming profession. welcome to the lemon ladies orchard in san mateo country. >> like a